Over the past few days I noticed there were always few wasps hanging around outside an upstairs window, so suspected they might be nesting in the loft, they don't bother me too much so didn't track them down or nuke them.
Found today they they are getting in at the corner of a window, a constant traffic of wasps in or out every few seconds, unfortunately it's a window I'm intending to replace in the next few weeks, so would like to persuade them to leave ...
I've blocked the hole up with blu-tack, for about an hour the returning ones were a bit confused and not exactly swarming around, but certainly a small cloud of them, now some of them seem to be going off looking for other places (I've kept windows all closed!)
How long before they give up? then I can let out the ones that will be trapped inside somewhere ...